How to pick target bitrates?
The bigdata approach : find some bitrates
which are mostly right for everybody
•Selected 7966 720p clips from YouTube
•Measure the two RD curves for the two
representations
• Record the “crossover bitrate” for
each clip
•Measure the CuF of the crossover
bitrates and select the 90% level as the
crossover bitrate which is
expected to be mostly right for 720p to
480p
•Target bitrates then use the same
calculation as previously i.e. Bitrate for
R2 is some fraction of that
•Bitrate of R1 is calculated similarly using
the CuF of max bitrates over the corpus
A Subjective Study for the Design of ABR
Streams, Chao Chen, Sasi Inguva,
Andrew Rankin and Anil Kokaram, IS&T
Visual Communications and Image
Processing Conference, San Francisco
Feb 2016